High capacity tape drive transparently writes and reads large pa

Details High capacity tape drive transparently writes and reads large pa High capacity tape drive transparently writes and reads large pa

1989-08-22

1993-05-11

Heckler, Thomas M.

Boots, shoes, and leggings

364DIG2, 3649513, 3649427, 3649526, G06F 306

Patent

active

052108511

ABSTRACT:
A tape packet assembler/disassembler (TPAD) for a tape drive accumulates host-transmitted records, which may or may not be blocked by the host. The accumulated host-transmitted records are combined into packets comprising a data portion made up of data blocks and of a trailer portion made up of table entries describing how to disassemble the packet. Host-transmitted commands to write a tape mark are intercepted by the TPAD and replaced by corresponding information in the trailer. Packets are accumulated in a buffer in the TPAD, and are written to the tape drive when the buffer becomes full, or upon a command from the host to reposition the tape, such as rewind. The interblock gaps that would ordinarily separate the host-transmitted records now separate packets, resulting in a considerable increase in the efficiency of tape utilization. The TPAD maintains in the trailer various pointers to assist in forward and back spacing by file and records. It also can automatically and adaptively compress and decompress the user's data. To assist in this it also maintains in the trailer information identifying data blocks containing a dictionary reset.

REFERENCES:
patent: 4040026 (1977-08-01), Gernelle
patent: 4162520 (1979-07-01), Cook et al.
patent: 4458316 (1984-07-01), Fry et al.
patent: 4534013 (1985-08-01), Sheth
patent: 4542457 (1985-09-01), Mortensen et al.
patent: 4750109 (1988-06-01), Kita
patent: 4845662 (1989-07-01), Tokumitsu

Affiliated with

Also associated with

Rating

High capacity tape drive transparently writes and reads large pa does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High capacity tape drive transparently writes and reads large pa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High capacity tape drive transparently writes and reads large pa will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1357642